Campbell Essential Biology (7th Edition)
Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 12, Problem 6SQ

What feature of a DNA fragment causes it to move through a gel during electrophoresis?

  1. a. the electrical charges of its phosphate groups
  2. b. its nucleotide sequence
  3. c. the hydrogen bonds between its base pairs
  4. d. its double helix shape
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Mrs. Elaine Markus is a 37-year-old woman with a history of migraine headaches and visual field disturbances. She has a left medial lower quadrant defect (an area of reduced visual function) that was noted in December of 2014 and has been stable. She recently developed a right temporal lower quadrant defect, which was first noted in September of 2019 and has had worsening symptoms in October. Prior Imaging An MRI in November showed a normal study of the brain including visual cortex and periventricular white matter, with a normal study of the orbits, optic nerves, and extra ocular muscles. A pituitary microadenoma (small benign tumor of the pituitary gland) of approximately 3 mm on the left side of the gland was found with no compromise of the optic chiasm. Mrs. Markus underwent further evaluation by MRI with pituitary cuts and the microadenoma was again noted left of midline causing no compression of the optic nerves nor invasion of the cavernous sinus. The microadenoma is…
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